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Subject: Re: [PATCH 3/3] mm: slub: Default slub_max_order to 0
From: James Bottomley <James.Bottomley@HansenPartnership.com>
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Date: Thu, 12 May 2011 13:36:15 -0500
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To: Pekka Enberg <penberg@kernel.org>
Cc: Christoph Lameter <cl@linux.com>, Dave Jones <davej@redhat.com>, Mel Gorman <mgorman@suse.de>, Andrew Morton <akpm@linux-foundation.org>, Colin King <colin.king@canonical.com>, Raghavendra D Prabhu <raghu.prabhu13@gmail.com>, Jan Kara <jack@suse.cz>, Chris Mason <chris.mason@oracle.com>, Rik van Riel <riel@redhat.com>, Johannes Weiner <hannes@cmpxchg.org>, linux-fsdevel <linux-fsdevel@vger.kernel.org>, linux-mm <linux-mm@kvack.org>, linux-kernel <linux-kernel@vger.kernel.org>, linux-ext4 <linux-ext4@vger.kernel.org>, Andrea Arcangeli <aarcange@redhat.com>

On Thu, 2011-05-12 at 20:11 +0300, Pekka Enberg wrote:
> On Thu, May 12, 2011 at 8:06 PM, Pekka Enberg <penberg@kernel.org> wrote:
> > On Thu, May 12, 2011 at 7:30 PM, James Bottomley
> > <James.Bottomley@hansenpartnership.com> wrote:
> >> So suggest an alternative root cause and a test to expose it.
> >
> > Is your .config available somewhere, btw?
> 
> If it's this:
> 
> http://pkgs.fedoraproject.org/gitweb/?p=kernel.git;a=blob_plain;f=config-x86_64-generic;hb=HEAD
> 
> I'd love to see what happens if you disable
> 
> CONFIG_TRANSPARENT_HUGEPAGE=y
> 
> because that's going to reduce high order allocations as well, no?

So yes, it's a default FC15 config.

Disabling THP was initially tried a long time ago and didn't make a
difference (it was originally suggested by Chris Mason).

James


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